like some people, i have decided to post bout e.o.ys. yay? yay. YAY! ok nvm.
but before i start, let's just remind u guys something.
know wat? suesin NEVER sent me the report. i gave her one more chance u noe. TODAY 12 A.M. SENT TO ME LATEST. hah. im waiting. see im so nice. i give so many chances. but maybe like wat ms yeo said, we can give so many chances, u can take so many chances, but will u change? no. will u start to have a conscience? no. then why give a chance?
o yesh. and people, when u tag, pls tag bout my post. i prefer u tagging bout my posts then talking rubish thank you.
now i shall talk bout geography!
Geography- WeatheringDefine weathering: the process whereby rocks are broken down in situ, that is rocks are broken down where they are.
weathering weaken rocks by:
1. changeing their chemical composition
2. causing them to break down into smaller fragments
define erosion: the process whereby the rocks are broken down into smaller pieces and are carried away after the process takes place.
types of weathering:
chemical- solution
physical- freeze and thaw (frost shattering)
biological- plant growth
Chemical weathering (carbonation)
rainwater combines with carbon dioxide in the air to form weak carbonic acid which dissolves limestones. the limestone will be converted to calcium bicarbonate to creat caves e.g. Niah caves in sarawak and Batu caves in K.L. calcium bicarbonate will solidify to form stalagtites and stalagmites.
ideal conditions - high rainfall in limestone area
physical weathering (freeze and thaw) (frost shattering)
water from melting snow or rain enters crack in rock. the water freezes and expands when the temperatures falls below 0 degrees celsius, the ice thaws and melts. when water solidifies, its volume increases by 10% . the ice then exerts pressure on the walls of the cracks. when temperature rises above 0 degrees celsius, the ice thaws and melts. this cycle will carry on for years brfore the crack starts to widen and break the rock into smaller pieces.
ideal conditions- places where temperature flactuates around the freezing point.
biological weathering (Plant growth)
wind carries seeds of plants into the cracks of rocks where they germinate and the roots of the plants grows into the rocks and force the cracks to widen. the roots will exert more strength as they grow bigger.
ideal conditions-high rainfall and high temperature for rapid plant growth.
Geography-Riversthe water cycle
drainage basin: the area of land which contains water drained by river.
evaporation: loss of moisture from plants
infiltration: absorption and downward movement of precipitation down into the soil.
precipitation: the process whereby water vapour in the atmospherfe reaches the earth.
sediment: load which is carried and deposited by the river.
source: place where river starts.
surface runoff: flowing of excess rainwater over the land surface.
throughflow: flow of water in the soil profile
channel: a natural stream that conveys water.
interception: water caught and retained by plants before evaporating.
transpiration: water absorbed by the roots system of the plant and escaping through the stoma.
valley: and elongated depression, sloping down to an area of inland drainage, lake, sea etc.
Processes in river erosion
Corrasion/abrasion: the wearing away or grinding of rocks. rocks in river hit side of river. forms potholes, widens riverbeds and deepens plunge pools.
Attrition: rocks in river hit rocks in river.
Solution/corrosion: water dissolve side of river e.g. limestone
Hydraulic action: water hit side side of river.
Headward erosion: lengthens the river in length.
Vetrical erosion: deepens the river.
Lateral erosion: widens the river.
River Transportation
Traction: Large rocks. slide and roll action.
Saltation: Medium rocks. hopping action.
Suspension: Fine particles. Floating action.
Solution: Solvent sction. minerals.
sigh. still got lots more. but too lei4 liao.
10 .47 p.m. liao.
almost 1 more hour to 12 a.m.
im still waiting.
tata.
